Published in Theoretical and Mathematical Physics
We study long nonlinear longitudinal bulk strain waves in a hyperelastic rod of circular cross section in the framework of general weakly nonlinear elasticity leading to a model with quadratic and cubic nonlinearities. We systematically derive extended equations of the Boussinesq and Korteweg-de Vries types and construct a family of approximate wea...
Published in Journal of Communications Technology and Electronics
Abstract—An analytical solution is obtained for the problem of excitation of electromagnetic waves by a horizontal dipole located at the interface between vacuum and a conducting two-layer medium, based on the smallness of the wavelength in a conducting medium compared to vacuum. Numerical calculations have been carried out, which made it possible ...
Published in Journal of Communications Technology and Electronics
AbstractAlternative circuit designs concerning the simulation of floating lossy inductors using voltage differencing buffered amplifiers (VDBAs) are described. The topologies proposed here require only three VDBAs and one capacitor to simulate a floating inductance with series and parallel resistance. The simulated equivalent elements, namely equiv...
Published in Journal of Communications Technology and Electronics
AbstractMathematical models are developed for planar symmetric slot antennas (SAs) with constant slot width using a tensor Green function that takes into account both principal and cross-polarization components in the far-field zone. It is shown that such models can be employed in the study of the electrodynamic properties of SAs with different con...
Published in Journal of Communications Technology and Electronics
A composite material based on identically oriented ellipsoidal inclusions distributed in a bonding medium is considered. The concept of the field acting in the composite and the effective dielectric constant is introduced. A formula for the effective dielectric constant of the composite is obtained, which in particular cases transforms into the wel...
Published in Journal of Communications Technology and Electronics
AbstractSuperconducting integrated circuits based on high-quality Nb–AlOx–Nb and Nb–AlN–NbN tunnel junctions, including a harmonic mixer with a high harmonic number, have been developed, optimized, and investigated. Details of the design, manufacturing methods, and specificities of operation of superconducting elements and circuits for the detectio...
Published in Journal of Communications Technology and Electronics
The modification of an algorithm for determining polynomial multipliers hci(x) of test polynomial hGMWS(x), which is the main component of the method for synthesizing Gordon–Mills–Welch sequences (GMWSs), is set as a basis for developing the software implementation of the algorithm for generating extra-long GMWSs having a two-level periodic autocor...
Published in Journal of Communications Technology and Electronics
AbstractCharacteristics of eigenwaves of two coupled EBG waveguides in an electromagnetic crystal are studied. Two variants of distributed coupling using an array of cylinders that are thinner than the crystal cylinders and an array of capacitive cylinders with gaps between the ends of cylinders and a screen are considered. It is shown that an addi...
Published in Journal of Communications Technology and Electronics
AbstractThe operation of a spin-injection emitter of electromagnetic oscillations with a Ni/NiO/Fe magnetic tunnel junction was first investigated. Using a nonconducting NiO spacer in a magnetic junction, the effect of the potential difference at the interface between magnetic layers on the efficiency of spin-injection emitters is determined. A mod...
Published in Journal of Communications Technology and Electronics
AbstractThe method for the constructive synthesis of planar antenna arrays (AAs) based on the neural network approach with consideration of interelement coupling is proposed. Within the AA mathematical model, it is assumed that when substantiating the AA configuration, antenna elements can be divided into groups of active, unused, or passive elemen...
